大跨越输电塔-线体系的近场脉冲型地震反应分析  

SEISMIC RESPONSE OF LARGE CROSSING TRANSMISSION TOWER-LINE SYSTEM SUBJECTED TO NEAR-FAULT GROUND MOTIONS

作　　者：武钢[1] 翟长海[1] 李爽[1] 谢礼立[1,2] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江150090 [2]中国地震局工程力学研究所,黑龙江150080

出　　处：《工程力学》2013年第6期77-82,106,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(90815014;51078117);地震行业科研专项(201208013);黑龙江省重点科技攻关项目(GB06C102)

摘　　要：分析了大跨越输电塔-线体系的动力特性,对比了大跨越输电塔-线体系的近-远场地震反应,研究了大跨越塔-线体系的近场脉冲地震反应规律。结果表明在同幅值的近场脉冲型地震动作用下,大跨越输电塔-线体系的动力反应远大于其在一般地震动下的反应,大跨越输电塔-线体系的近场脉冲型地震反应幅值随地震动脉冲周期增大而增大。将等效脉冲模型引入大跨越输电塔-线体系近场响应分析,结果表明:塔-线体系在等效脉冲作用下的响应与实际地震动相近,将等效脉冲用于分析大跨越输电塔-线体系的地震响应能够弥补实际近场脉冲型地震动数目过少的不足。Dynamic characteristics of a large crossing transmission tower-line system （LCTTL） are analyzed. The seismic responses of a large crossing transmission tower-line system subjected to near-fault pulse-like ground motions and ordinary ground motions are compared. The characteristics of responses caused by near-fault pulse-like ground motions are presented. It is shown that the seismic responses of LCTL induced by near-fault pulse-like ground motions are severer than the responses subjected to ordinary ground motions. The amplitude of seismic responses increases with the pulse period of near-fault pulse-like ground motions. An equivalent pulse model is introduced to seismic response evaluation of LCTL. The results demonstrate that the equivalent pulse model can capture the important response characteristics of the near-fault records. The application of equivalent pulse model in seismic responses analysis of LCTL can augment the number of near-fault record set.

关 键 词：输电塔 大跨越 近场 导线 地震反应 

分 类 号：TU391[建筑科学—结构工程]